all you need to do is multiply out the brackets.
you solve them by using the FOIL method:
Firsts: (the first number in each bracket) 3m x 8m = 24m²
Outsides: (the numbers on the outer edges of the equation) 3m x 7 = 21m
Insides: (the numbers on the inner edges of the equation) -1 x 8m = -8m
Lasts: (the last number in each bracket) -1 x 7 = 7
you then put all the answers together into one equation so:
24m² + 21m - 8m + 7
and finally, collect like terms:
24m² + 13m + 7
hope i helped
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